PDF4 serves as a comprehensive mobile toolkit for handling PDFs, allowing users to scan, edit, convert, and secure their documents directly on their devices. It offers an array of powerful editing capabilities, enabling modifications to text, images, and pages, along with merging, splitting, reordering, or rotating content. Additionally, it features advanced conversion options that allow the transformation of images or Office formats into PDF files and vice versa, such as converting PDF documents into Word, PowerPoint, or Excel formats. The application also incorporates Optical Character Recognition (OCR) for extracting searchable text, as well as providing options for password protection, annotations, and filling forms. Users can further enhance their workflow by compressing files, cropping pages, and adding metadata, watermarks, or barcodes. The software also includes automation features like job flows for batch processing, catering to users on desktop devices. Moreover, it offers extensive integrations such as browser extensions, connectors for Zapier and Power Automate, and add-ins for Microsoft Teams and Outlook, facilitating efficient PDF management across various platforms and enhancing collaborative efforts.